part a which of these dna molecules is the shortest? a gel with the negative electrode at the top and the positive electrode at the bottom. the loading well is located at the top. dna fragments are labeled a, b, c, d, and e. fragment a is located at the top near the loading well. fragment b is located just below fragment a. fragment c is about halfway down the gel, and fragment d is just below it. fragment e is furthest down the gel, closest to the positive electrode. which of these dna molecules is the shortest? a gel with the negative electrode at the top and the positive electrode at the bottom. the loading well is located at the top. dna fragments are labeled a, b, c, d, and e. fragment a is located at the top near the loading well. fragment b is located just below fragment a. fragment c is about halfway down the gel, and fragment d is just below it. fragment e is furthest down the gel, closest to the positive electrode. a b c d e